DS is 6 mo (3 corrected) and everytime he sleeps a little longer than I expect him to, I check for breathing.

I know this is silly, and I'm not seriously expecting any problems, but it's just for reassurance. I don't remember how long I did this with my older ones, or if it is just because this LO was so early...
Re: How old was LO before you stopped checking for breathing while sleeping? :)
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LOL, this! Corri will be 9 months old on Sunday, and I still jolt awake several times a night to check the video monitor, make sure she's breathing during naps, and both DH and I pop into her room if we walk by to check yet again. The NICU scared the heck out of us with regard to SIDS, so until at least her first birthday, I will be obsessively checking.
This exactly. My daughter will be three in Feb, and I still check her breathing when I go in to kiss her goodnight on my way to bed.
Our son is 2 yrs old, and born 12 weeks early too. We used the Angel Care monitor since the first day in his crib (he slept in a bassinet in our room the first 2 months, and I barely got any sleep, waking at every sound...and then waking at too long with NO sounds!)
The Angel Care monitor only went off twice by accident in the 15-18 months we used it. Both times, he had rolled into the far corner, and sleeping on his side. So I knew that the monitor really worked. It gave me SO much peace of mind. I highly recommend it. I have to say that it let me take my mind of of thinking of his breathing, and I no longer worried about it.
I totally understand where you're coming from. A mother never forgets being in the NICU and hearing loud beeps b/c their child's heart rate or breathing had stopped.